Radio Signatures of Coronal Magnetic Fields and Reconnections

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Presentation transcript:

Radio Signatures of Coronal Magnetic Fields and Reconnections Guang-Li Huang Purple Mountain Observatory Nanjing, P. R. China Nobeyama Symposium, 2004

Key problems of solar observations in comparison with models (Forbs, 2004) Measurement of coronal magnetic fields - Radio diagnosis as one possibility Measurement of exact time and location of magnetic reconnections – Radio Fine Structures as the signatures of magnetic reconnections Scientific objectives of radio telescopes in near future (FASR and etc.) Nobeyama Symposium, 2004

Diagnosis of magnetic fields under Dulk & Marsh’s approximations (Huang, 2000) Nobeyama Symposium, 2004

Calculation of propagation angles with polarization degree (Huang et al., 2002) Nobeyama Symposium, 2004

2-D magnetic field with Nobeyama data (Huang et al., 2002) Nobeyama Symposium, 2004

Calculation of propagation angles with turnover frequency (Huang et al Nobeyama Symposium, 2004

General calculations (Huang, 2004) Nobeyama Symposium, 2004

Calculation with Ramaty and Takakura’s model (Huang et al., 2004) Nobeyama Symposium, 2004

Effects of low energy cutoffs (Huang et al., 2004) Nobeyama Symposium, 2004

Effects of magnetic fields (Huang et al., 2004) Nobeyama Symposium, 2004

Effects of other parameters (Huang et al., 2004) Nobeyama Symposium, 2004

Calculations of nonthermal density (Zhou et al., 2004) Nobeyama Symposium, 2004

Millisecond radio spikes on Nov 2, 1997 (Huang, 2004) Nobeyama Symposium, 2004

17 GHz contours overlaid on SXT and MDI (Huang, 2004) Nobeyama Symposium, 2004

Location of the spike source (Huang, 2004) Nobeyama Symposium, 2004

Radio fine structures - precursors - on Aug 25, 1999 (Huang et al Nobeyama Symposium, 2004

17/34 GHz contours overlaid on SXT (Huang et al., 2003) Nobeyama Symposium, 2004

Location of reconnections – ropes (Huang et al., 2003) Nobeyama Symposium, 2004

New-classical effects in this event (Tan & Huang, 2004) Nobeyama Symposium, 2004

Radio ejection accompanied with CME on April 21, 2002 (Huang, 2004) Nobeyama Symposium, 2004

Together with moving type IV (Huang, 2004) Nobeyama Symposium, 2004

Three drift rates – current sheet, shock, and acceleration (Huang, 2004) Nobeyama Symposium, 2004

Evidence of Nobeyama data with CME on Oct 26, 2003 (Ning et al., 2004) Nobeyama Symposium, 2004

Some other works of Chinese solar radio people using Nobeyama data Polarization analysis with NoRH images (Su & Huang, 2004) Spectral index with NoRH and RHESSI (Su & Huang, 2004) Complexity of NoRH sources with CMEs (Shao et al., 2004, in process) Statistics of flare list of NoRH (Tan et al., 2004, in process) Nobeyama Symposium, 2004

Summary Nobeyama data are necessary for radio diagnosis of magnetic fields and reconnections in low corona Chinese solar radio people pay much attention to Nobeyama data due to the same time schedule of observations in China and Japan Acknowledgement Nobeyama Symposium, 2004